You and Sirius were really good friends. He taught Math, and You taught science. The students always shipped you too together because of how much time you spend together. If Sirius didn't have a class to teache he would be in your room. If you didn't have a class, you were always in his room.

Sirius had walked into your room for some extra scrap papers. The students saw him enter the room and instantly went quiet to watch the two teachers